Answer: The answer is “ By dissolving the same number of nmoles of each substance in the same volume of water ”
Explanation:
By dissolving the same number of moles of each substance in the same volume of water. Hence, option D is correct.
Define the molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.
Adding water to a solution and the number of moles of the solvent stay the same while the volume increases.
If there is no flow of solute into or out of the volume during the addition of the solvent, the number of moles of solute remains the same.
Hence, option D is correct.
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What is the volume of 12.0 M NaOH needed to prepare 5.00 L of a 2.50 M NaOH solution? What volume of water (solvent) is required to make this dilution? Please show work
Answer:
Approximately [tex]1.04\; \rm L[/tex] of the [tex]12.0\; \rm M[/tex] [tex]\rm NaOH[/tex] solution is needed. Approximately another [tex]3.96\; \rm L[/tex] of water will also be required.
Assumption: the volume of these [tex]\rm NaOH[/tex] solutions does not depend on the quantity of [tex]\rm NaOH\![/tex] (the solute) that each of them contain.
Explanation:
Calculate the number of moles of [tex]\rm NaOH[/tex] formula units in that [tex]5.00\; \rm L[/tex] of [tex]2.50\; \rm M[/tex] [tex]\rm NaOH\![/tex] solution:
[tex]n(\mathrm{NaOH}) = c\cdot V = 5.00\; \rm L \times 2.50\; \rm mol \cdot L^{-1} = 12.5\; \rm mol[/tex].
Calculate the volume of a [tex]12.0\; \rm M[/tex] [tex]\rm NaOH[/tex] with that many [tex]\rm NaOH\![/tex] formula units:
[tex]\displaystyle V = \frac{n}{c} = \frac{12.5\;\rm mol}{12.0\; \rm mol \cdot L^{-1}}\approx 1.04\;\rm L[/tex].
That should be the volume of the [tex]12.0\; \rm M[/tex] [tex]\rm NaOH[/tex] solution needed to prepare that [tex]5.00\; \rm L[/tex] of [tex]2.50\; \rm M[/tex] [tex]\rm NaOH\![/tex] solution. However, [tex]1.04\; \rm L[/tex] corresponds to only about one-fifth the volume of a [tex]5.00\; \rm L\![/tex] solution. The difference in volume should be filled with pure water:
[tex]\begin{aligned}V(\text{water}) &\approx 5.00\; \rm L - 1.04\; \rm L = 3.96\; \rm L\end{aligned}[/tex].
Explain the difference between the reactants and
products of a chemical reaction.
MP
Answer:
HOPE THIS HELPED :) good luck! ❤️
Explanation:
A reactant is a substance that is present at the start of a chemical reaction. The substance to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
Answer:
Reactants are the starting substances and products are the ending substances in a chemical reaction. The atoms in reactants are arranged one way and are rearranged in a different way to form the products (in other words, reactants are chemically different from products). The properties of reactants differ from the properties of products.
Explanation:
Sample response on Edge 2021
what are proteins? (simple definition please)
Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Hope this helps!
Answer:
Proteins are carbohydrates that come from nutritious food.
They are one of the four main carbohydrates.
This is a simple definition of the word proteins.
Hope this helps!
16. As he developed his periodic table, Mendeleev grouped the elements lithium,
sodium, and potassium together. What observation was likely a factor in his decision
to group these elements?
Answer:
the reactivity and the valence electrons
Explanation:
the reactivity of the elements would have played a significant role in why such elements were grouped together. the number of valence electrons dictates how reactive an element is - the less valence electrons the more reactive it is. the column, group 1 in which these elements are put together in, show that each of the elements have 1 valence electrons and are therefore reactive.
you can go on to further explain what valence electrons are, explain what the group numbers are associated with the valence electrons and how valence electrons effect reactivity. further this, talk about how the three elements have the same number of valence electrons and therefore were grouped together
how many moles of tin (II) fluoride will be produced if 22.9 grams of hydrogen fluoride react
Answer:
From 22.9 g of HF 0.575 moles of tin(II) fluoride are produced.
Explanation:
Given data:
Moles of tin(II) fluoride produced = ?
Mass of hydrogen fluoride react = 22.9 g
Solution:
Chemical equation:
SnO + 2HF → SnF₂ + H₂O
Number of moles of HF:
Number of moles = mass/ molar mass
Number of moles = 22.9 g/ 20 g/mol
Number of moles = 1.15 mol
Now we will compare the moles of SnF₂ with HF.
HF : SnF₂
2 : 1
1.15 : 1/2×1.15 = 0.575 mol
Thus, from 22.9 g of HF 0.575 moles of tin(II) fluoride are produced.
Place each object on the measurement tray, one at a time. Which objects have a mass greater
than 300 grams?
How do you know?
Answer:
The cube
Explanation:
When the cube is put on the triple beam balance it gives the mass of 429.3
the pH of a HClO4 solution was measured as 4.251. What would be the concentration of HClO4 in this solution
Answer:
[tex]0.000056[/tex]
Explanation:
If [tex]pH[/tex] is given then hydronium ion concentration is equal to [tex]-log[H_3O^+][/tex]
The hydronium ion concentration can be found from the pH using the following formula:
Hydronium ion concentration = [tex]10^{-pH}[/tex]
As the pH of a HClO4 solution was measured as 4.251,
put [tex]pH=4.251[/tex]
So,
Concentration of HClO4 in the solution = [tex]10^{-4.251}=0.000056[/tex]
PLEASE HELP IMMEDIATELY
Which statement best describes how nearly all rock is formed?
A. Soil gradually hardens beneath Earth's surface
B. A different type of rock is broken down or changes in
in some way
C. Fire, water, or air cools into layers of rock
D. A mixture of minerals separates into several pure minerals.
Answer:
B
Explanation:
The rock cycle is a series of processes that create and transform the types of rocks in Earth’s crust. A different type of rock is broken down or changes in some way. The correct option is B.
What are types of rocks?Sedimentary, igneous, and metamorphic rocks are the three main categories of rocks. Each of these rocks is the result of physical processes that are a part of the rock cycle, such as melting, cooling, eroding, compacting, or deforming.
Rock fragments from other types of existing rocks or organic material are used to create sedimentary rocks. Clastic, organic (biological), and chemical sedimentary rocks are the three different types of sedimentary rocks.
Rocks that have undergone extreme heat or pressure and changed from their initial state are known as metamorphic rocks. When molten, heated material cools and solidifies, igneous rocks are created (their name is derived from the Latin word for fire).
Thus the correct option is B.
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using a curling iron to curl your hair is
conduction
convection
radiation
Answer:
its Radiation
Explanation:
Because it transfers heat from a object to a less hot object in this case from a hot curling iron to your hair.
PLEASE HELP!!! Do you think the number of animals that eats plants is related to the number of plants?
Answer:
Yes
Explanation:
As the number of animals that eat plants increase, the number of plants decrease. This is because the animals are eating a larger and larger number of plants and reducing the population.
When the number of plants gets too low, the animals will not be able to survive, and they will start to decrease in numbers. In turn, the plants will increase again. Eventually, they will reach an equilibrium.
the object in question 1 has a mass of 21.535g. what metal is the cylinder most likely made of? why? pls help asap!!
Answer:
Aluminium
Explanation:
From the question given above, the following data were obtained:
Diameter (d) = 1.25 cm
Height (h) = 6.48 cm
Volume (V) of cylindrical=.?
Mass (m) of cylindrical object = 21.535 g
Density of the cylindrical object =..?
Next, we shall determine the radius of the cylindrical object. This is illustrated below:
Diameter (d) = 1.25 cm
Radius (r) =?
r = d/2
r = 1.25/2
Radius (r) = 0.625 cm
Next, we shall determine the volume of the cylindrical object. This can be obtained as follow:
Height (h) = 6.48 cm
Radius (r) = 0.625 cm
Pi (π) = 3.14
Volume (V) of cylindrical=.?
V = πr²h
V = 3.14 × 0.625² × 6.48
V = 7.948 cm³
Recall:
1 cm³ = 1 mL
Therefore
7.948 cm³ = 7.948 mL
Thus, the volume of the cylindrical object is 7.948 mL
Finally, we shall determine the metal in which the cylindrical object is made up of by calculating the density of the cylindrical object. This can be obtained as follow:
Mass (m) of cylindrical object = 21.535 g
Volume of the cylindrical object = 7.948 mL
Density of cylindrical object =?
Density = mass /volume
Density = 21.535 / 7.948
Density of cylindrical object = 2.7 g/mL
Comparing the density of the cylindrical object (i.e 2.7 g/mL) with those given in the table in the question, the cylindrical object is made of aluminium since they have the same density.
What is the air temperature 8,850 m in the air?
Select the true statement(s) abut Polymers: Group of answer choices Thermoplastics have low melting temperature because of the week van der Waals bonds between their Long Chain Molecules Thermoplastics have low strength because of the week van der Waals bonds between their Long Chain Molecules Polymers have low densities because of the week van der Waals bonds between their Long Chain Molecules Polymer chains once synthesized they will remain stable in the environment because of the strong covalent bonds in the Long Chain Molecules
Answer:
Thermoplastics have low melting temperature because of the week van der Waals bonds between their Long Chain Molecules
Polymer chains once synthesized they will remain stable in the environment because of the strong covalent bonds in the Long Chain Molecules
Explanation:
Thermoplastics are polymers that are easily melted and changed to another shape as many times as possible. They become molten when they are heated and solidify when cooled. Examples of thermoplastics include; polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamides, polyesters, and polyurethanes.
Polymers are organic materials that consists of a long chain of atoms held together by strong covalent bonds. Polymers constitute an important environmental concern because most polymers are non biodegradable and remain in the environment almost indefinitely.
Is avocado a fruit or a vegetable?
(dont me with my question rn xD)
Which graph represents a function?
Answer:
I need to se the options
How many oxygen atoms are there in 450.0 grams of Na2SO4?
Answer:
112.5
Explanation:
I think so because in one unit has 4 oxygen atoms.
How many moles of Hions are present in the following aqueous solution?
3.3 mL of a 0.65 M nitric acid:
Answer:
Nitric acid is a strong acid meaning it completely dissociates in water. Therefore, you can say that the concentration of H+ ions in solution is the same as the concentration of the acid (molar concentration). So once you have that, you can use the pH formula to find the pH of the acid.
pH = -log[H+]
So if you have .15 M HNO3 the pH is 0.82.
But, if you have a different concentration, the pH will change.
Explanation:
the sun warming the surface of a rock is
conduction
convection
radiation
A crate is pulled with a force of 165 N at an angle 30 °
northwest. What is the resultant horizontal force on the crate?
Help asap
Answer:
143 N
Explanation:
Compare and contrast ionic and covalent bonds by explaining what the electrons do when bonding occurs. Use details to support your answer.WILL GIVE BRAINLIEST
what do borates do structurally that none of the other non silicates with anionic complexes do g
Answer:
Kindly check the explanation section.
Explanation:
The chemical compound known as Borates has the Molecular Formula: BO3^-3. It has the shape of a triangle but Borates can form multiples ones that is to say quadrangles. Also, as a result of the fact that the octect is not complete, Borates are used as lewis Acid.
The oxygen present in Borates is/are directly attached to the central atom that is Boron while in non silicates the oxygen(s) that may be present is not directly attached to the central atom.
The mass of a golf ball is 45.9 g . If it leaves the tee with a speed of 61.0 m/s , what is its corresponding wavelength?
Answer:
The corresponding wavelength is 2.4×10⁻³⁴ m.
Explanation:
Given data:
Mass of ball = 45.9 g (45.9/1000 = 0.0459 kg)
Speed of ball = 61.0 m/s
Wavelength = ?
Solution:
Formula:
λ = h/mv
λ = wavelength
h = Planck's constant
m = mass
v = velocity
Now we will put the values in formula.
λ = 6.63×10⁻³⁴ kg.m².s⁻¹ / 0.0459 kg ×61.0 m/s
λ = 6.63×10⁻³⁴kg.m².s⁻¹ /2.8 Kg.m/s
λ = 2.4×10⁻³⁴ m
The corresponding wavelength is 2.4×10⁻³⁴ m.
"Why does a hamburger have fewer calories than a steak? Because it's in the ground state!" Explain the joke while also highlighting what the ground state means for electrons in a way that someone who has never taken chemistry before will understand.
Answer:
it means a hamburger has less calories bc its referring to steak that has been grounded and the highlight would be calories
Materials with air pockets that decrease their density and prevent energy transfer are called:
A. Insulators
B. Thermometers
C. Conductors
D. Compressors
What is the mass number of neon (Ne)?
A. 20
B. 18
C. 10
D. 2
Answer:
A
Explanation:
it is round up to 20
Answer:
20 is the answer (A)
Explanation:
Neon/Atomic mass
20.1797 u
this is approximately 20 so 20 is the answer (A)
hope this helps!
1. Lani conducted an experiment in which she tested the reactivity of a substance. She placed two
equal samples of a substance into identical beakers. She then filled one beaker with water and
filled the other with vinegar. After a week, she measured the samples. What was the
independent variable in her experiment?
Answer:
the independent variable is the beakers
Explanation:
pleasee help asap pleasee
Answer:
b.) 100 meters c.) 6 seconds d.) 16.6 e.) 16.6m/s
Explanation:
Which characteristics describe the genetic code of humans? Select three options
Answer:
1. Can help in development of effective medications
2. Can help explain genetic diseases
3. Composed of about 19,000 genes
Explanation:
The other answer options are misleading.
Genetic code of humans can help with understanding more than just human genetics.
Human genetics is composed of 23 chromosome pairs, for a total of 46 chromosomes.
Fluorescent light bulbs, or CFLs, prevent the loss of energy from light bulbs as ________ energy.
Answer:
Compact fluorescent lamps, or CFLs, use 75 percent less energy than a traditional incandescent bulb, but they never quite caught on for home use.Feb
the elements least likely to form bonds are found in witch group?1
A. 15
B. 16
C. 17
D. 18
Answer:
D. 18
Explanation:
group 18 elements are called noble gases.
They have complete octet in their valance shell. Therefore, they are least likely to form bonds with other elements.
